JP6261083B2 - Electrostatic coating gun, electrostatic coating gun charging device, and electrostatic coating device - Google Patents

Description

  The present invention relates to an electrostatic coating gun, a charging device for an electrostatic coating gun, and an electrostatic coating device.

  Patent Document 1 discloses a technique for supplying power to a high voltage generator of an electrostatic coating gun from a remote type power source in an explosion-proof area. In this power source, a generator housed in an explosion-proof housing is driven by an air turbine, and the power generated by the generator is supplied to a high voltage generator via a power supply cable. Yes.

Japanese Patent Laid-Open No. 10-165849

  The electrostatic coating gun is connected not only to a power supply cable but also to a hose for supplying paint and a hose for supplying air. Therefore, when operating the electrostatic coating gun, these cables and hoses may get in the way, leading to a decrease in operability during the painting operation. As a countermeasure, a method is conceivable in which a battery is attached to the electrostatic coating gun and the high voltage generator is fed with the battery as a power source. According to this method, since it is not necessary to connect a power supply cable, it is easier to handle the electrostatic coating gun. However, since the painting booth is an explosion-proof area, when replacing a consumed battery, the electrostatic painting gun must be moved to a non-explosion-proof area, and workability is not good.

  The present invention has been completed based on the above-described circumstances, and an object of the present invention is to make it possible to take measures against exhaustion of power storage members such as batteries in an explosion-proof area.

The electrostatic coating gun according to the first invention is
A nozzle for discharging paint,
A high-voltage generator that applies static electricity to the paint,
A power storage member that is rechargeable and supplies power to the high voltage generator;
A power receiver connected to the power storage member,
The power storage member is charged by a power transmitter that transmits power from a charging power source provided in a non-explosion-proof region to the power receiver without contact.

The charging device for the electrostatic coating gun according to the second invention is:
A charging device for charging a power storage member provided in an electrostatic coating gun and supplying power to a high voltage generator ,
A power receiver provided on the electrostatic coating gun and connected to the power storage member;
It is characterized in that it is connected to a charging power source provided in a non-explosion-proof area and the power receiver includes a power transmitter capable of transmitting power without contact.

The electrostatic coating apparatus which is the third invention is
Painting equipment that works when powered,
A chargeable power storage member provided in the painting device;
A power receiver provided in the coating device and connected to the power storage member;
It is characterized in that it is connected to a charging power source provided in a non-explosion-proof area and the power receiver includes a power transmitter capable of transmitting power without contact.

  In the first and second inventions, power transmission from the power transmitter to the power receiver of the electrostatic coating gun is performed in a contactless manner. Therefore, when the power storage member is exhausted, the power storage member remains attached to the electrostatic coating gun and remains in the explosion-proof region. Can be charged with. Thus, according to the first and second aspects of the invention, it is possible to take measures against exhaustion of the power storage member within the explosion-proof area.

  In the third invention, since power transmission from the power transmitter to the power receiver of the painting device is performed without contact, when the power storage member is consumed, the power storage member is attached to the painting device and charged in the explosion-proof area. be able to. As described above, according to the third aspect of the present invention, it is possible to take measures against exhaustion of the power storage member within the explosion-proof region.

Schematic block diagram of the electrostatic coating apparatus of Example 1 Partial cutaway side view of electrostatic paint gun Block diagram showing the configuration of the high voltage generator and power supply unit installed on the electrostatic coating gun

  (1) An electrostatic coating gun according to a first aspect of the present invention includes a barrel portion in which the nozzle is provided at a front end portion and the high voltage generator is accommodated therein, and extends downward from a rear end portion of the barrel portion. A grip gripped by an operator, and the power storage member may be formed inside the grip. According to this configuration, since the relatively heavy power storage member is disposed in the grip, the gravity center position of the electrostatic coating gun is close to the grip, the weight balance is improved, and the burden on the operator is reduced. .

  (2) The electrostatic coating gun of the first invention has an air flow path for supplying air to the nozzle, and the air flow path is formed to face the outer surface of the power storage member. May be. According to this configuration, the power storage member that rises in temperature during power feeding or charging can be cooled by the air flowing through the air flow path.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS.

<Electrostatic coating equipment>
The overall configuration of the electrostatic coating apparatus of the present embodiment will be described. As shown in FIG. 1, the electrostatic coating apparatus includes an electrostatic coating gun 10 (coating device according to the claims) including a secondary battery 41 (electric storage member according to the claims), and an electrostatic coating gun. A paint pump 11 for supplying paint to 10, a cleaning liquid pump 12 for supplying cleaning liquid to the electrostatic coating gun 10, and an air supply source 13 for supplying pressurized air to the electrostatic coating gun 10 It has. The electrostatic painting gun 10, the paint pump 11, the cleaning liquid pump 12, and the air supply source 13 are arranged in the painting booth (explosion-proof area A).

  A switching valve 15 is provided in the paint supply path 14 from the paint pump 11 to the electrostatic paint gun 10. A hand switch 16 (painting device described in claims) is connected to the switching valve 15. The hand switch 16 is also disposed in the explosion-proof area A like the electrostatic coating gun 10 and the like. A secondary battery 51 (an electricity storage member described in claims) is attached to the hand switch 16. When the operator operates the hand switch 16, power is supplied from the secondary battery 51 to the solenoid (not shown) of the switching valve 15, and the switching valve 15 supplies paint to the electrostatic coating gun 10 and the cleaning liquid. It is designed to switch to a state that supplies power.

  A flow meter 17 (painting device described in claims) is provided in the paint supply path 14 upstream of the switching valve 15. The flow meter 17 is also disposed in the explosion-proof area A like the electrostatic coating gun 10 and the like. Similarly to the electrostatic coating gun 10 and the hand switch 16, the secondary battery 61 (the power storage member described in the claims) is also attached to the flow meter 17. With the electric power of the secondary battery 61, the flow meter 17 measures the flow rate of the paint. The secondary batteries 41, 51, 61 attached to the electrostatic coating gun 10, the hand switch 16, and the flow meter 17 are charged by charging devices 40, 50, 60 described later.

<Electrostatic painting gun 10>
The electrostatic coating gun 10 is a hand gun that an operator grasps and performs a painting operation. As shown in FIGS. 2 and 3, the electrostatic coating gun 10 includes a gun body 20, a high voltage generator 35, and a power supply device 30. The gun body 20 includes a barrel 21 made of a synthetic resin having electrical insulation and a grip 22 made of a synthetic resin having electrical conductivity. The upper end portion of the grip 22 is assembled to the rear end portion of the barrel portion 21. An operator performs a painting operation by grasping the grip 22. A nozzle 23 for discharging paint, atomizing air, and pattern air is attached to the front end of the barrel 21.

  A downstream end of a paint supply tube 24 for supplying paint to the nozzle 23 is connected to the front end of the barrel part 21. The upstream end of the paint supply tube 24 is connected to the downstream end of the paint supply hose 26 via a bracket 25 attached to the lower end of the grip 22. The paint supply tube 24 and the paint supply hose 26 constitute the paint supply path 14, and the upstream end of the paint supply hose 26 is connected to the switching valve 15. An air flow path 27 for supplying air to the nozzle 23 is formed in the grip 22 and the barrel portion 21. The upstream end of the air flow path 27 is connected to the air supply hose 28 at the lower end surface of the grip 22. The air supply hose 28 is connected to the air supply source 13.

  An electrode 29 for applying a high voltage to the paint discharged from the nozzle 23 is attached to the front end of the barrel part 21. A high voltage generator 35 for supplying high voltage DC power suitable for electrostatic coating to the electrode 29 is accommodated in the barrel portion 21. Further, the rear end portion of the barrel portion 21 and the grip 22 accommodate a power supply device 30 for supplying AC power to the high voltage generator 35. When a trigger attached to the barrel portion 21 is operated, a valve (not shown) is opened, paint and air are supplied to the nozzle 23, and power is supplied from the power supply device 30 to the high voltage generator 35. The electrode 29 becomes a high voltage. As a result, the paint applied at a high potential is atomized by the air and ejected in a state of being formed into a predetermined pattern and applied to an object to be coated (not shown).

  As shown in FIG. 3, the power supply device 30 includes an oscillation circuit 31, a secondary battery 41 as a DC power supply, and two switching elements 32. The oscillation circuit 31 generates a pulsed drive signal based on a command signal from a control unit (not shown). Due to this drive signal, the switching element 32 switches the output of the secondary battery 41 between the positive side and the negative side, so that a low-voltage AC voltage is generated. This AC voltage is supplied to the high voltage generator 35.

  The high voltage generator 35 includes a step-up transformer 36, a voltage doubler rectifier circuit 37 (Cockcroft-Walton circuit), and an output resistor 38. The AC voltage supplied from the power supply device 30 to the high voltage generator 35 is boosted by the step-up transformer 36, boosted and rectified by the voltage doubler rectifier circuit 37, and converted to a high voltage of about 10 kV to 60 kV. The DC high voltage boosted and rectified by the voltage doubler rectifier circuit 37 is supplied to the electrode 29 via the output resistor 38.

  A power receiver 42 constituting the charging device 40 for the electrostatic coating gun 10 is disposed at the lower end portion of the secondary battery 41 constituting the power supply device 30. The secondary battery 41 and the power receiver 42 are integrated to form a battery pack 70. The battery pack 70 has a block shape that is long in the vertical direction as a whole, and is accommodated in an accommodation space 71 formed in the grip 22. The rear surface side of the accommodation space 71 is opened to the outside of the grip 22, and serves as an opening 72 for attaching / detaching the battery pack 70 to / from the accommodation space 71. The opening 72 is closed with a cover 73, and the cover 73 is fixed to the grip 22 with screws (not shown). By fixing the cover 73, the fitting portion between the opening 72 and the cover 73 is held in an airtight manner by the seal member 74.

  Further, the battery pack 70 in the accommodation space 71 is held in the movement restricted state. A pair of output terminals (not shown) formed in the secondary battery 41 are provided on the upper surface of the battery pack 70. On the other hand, on the ceiling surface of the accommodation space 71, a pair of elastically deflectable input terminals (not shown) connected to the step-up transformer 36 are provided. When the battery pack 70 is housed in the housing space 71, the pair of input terminals elastically contact the pair of output terminals.

  The air flow path 27 is arranged in the vertical direction in the grip 22 and is arranged in the front-rear direction in the barrel part 21. The air flow path 27 surrounds the main flow path 75 extending in the vertical direction along the front surface of the battery pack 70 in the grip 22 and the front and rear surfaces and the left and right surfaces of the battery pack 70 in the grip 22 over the entire circumference. And a circulation channel 76. The circumferential flow path 76 has a shape in which the inner circumferential surface of the accommodation space 71 is shallowly recessed over the entire circumference, and faces the outer circumferential surface of the battery pack 70. Further, since the circulation channel 76 communicates with the main channel 75 in the entire height range, the accommodation space 71 and the air channel 27 also communicate with each other. Part of the air that has flowed from the air hose into the lower end (upstream end) of the main flow path 75 passes through the circulation flow path 76 and returns to the main flow path 75 while contacting the outer peripheral surface of the battery pack 70. The air flowing through the circulation channel 76 takes heat from the battery pack 70.

<Charging devices 40, 50, 60>
The electrostatic coating apparatus of this embodiment includes a charging device 40 for charging a secondary battery 41 built in the electrostatic coating gun 10. The charging device 40 includes a power receiver 42 attached to the electrostatic painting gun 10 while being connected to the secondary battery 41 as described above, and a power transmitter 43 disposed outside the electrostatic painting gun 10. It is prepared for. As with the electrostatic coating gun 10, the power transmitter 43 is fixedly provided at a predetermined position in the explosion-proof area A. The power transmitter 43 is connected to a commercial AC power source 77 (charging power source described in claims) disposed in the non-explosion-proof area B.

  The electrostatic coating apparatus includes a charging device 50 for charging the secondary battery 51 attached to the hand switch 16. The charging device 50 is configured to include a power receiver 52 attached to the hand switch 16 while being connected to the secondary battery 51, and a power transmitter 53 disposed outside the hand switch 16. The power transmitter 53 is fixedly provided at a predetermined position in the explosion-proof area A, like the hand switch 16. The power transmitter 53 for the hand switch 16 is connected to the same commercial AC power source 77 as the power transmitter 43 for the electrostatic coating gun 10 (charging power source described in claims).

  The electrostatic coating apparatus includes a charging device 60 for charging the secondary battery 61 attached to the flow meter 17. The charging device 60 includes a power receiver 62 attached to the flow meter 17 in a state connected to the secondary battery 61, and a power transmitter 63 disposed outside the flow meter 17. The power transmitter 63 is connected to the commercial AC power source 77 (the charging power source described in the claims) through a flexible power supply cable 78. The power transmitter 63 is arranged in the explosion-proof area A like the flow meter 17, and can be moved freely within the length of the power supply cable 78.

  In these charging devices 40, 50, 60, when the power receivers 42, 52, 62 approach the power transmitters 43, 53, 63, the power from the commercial AC power supply 77 is transferred from the power transmitters 43, 53, 63 to the power receivers 42, 53. The secondary batteries 41, 51, 61 connected to the power receivers 42, 52, 62 are charged. Power transmission from the power transmitters 43, 53, 63 to the power receivers 42, 52, 62 is performed in a non-contact (non-contact) manner. As a method of non-contact power transmission, an electromagnetic induction method in which an electromotive force is generated in the coils (not shown) of the power receivers 42, 52, 62 by passing a current through the coils (not shown) of the power transmitters 43, 53, 63, A radio wave system that converts the current passed through the power transmitters 43, 53, and 63 into electromagnetic waves and transmits the electromagnetic waves to the power receivers 42, 52, and 62 via an antenna (not shown) can be used. Therefore, when the power transmitters 43, 53, and 63 and the power receivers 42, 52, and 62 are brought close to each other for charging or moved away after charging, the contacts do not come into contact with or separate from each other.

<Operation of Example>
When the capacity of the secondary battery 41 of the electrostatic coating gun 10 decreases, the electrostatic coating gun 10 is moved to a predetermined charging position in the explosion-proof area A, and the power receiver 42 of the grip 22 is connected to the charging device 40. Approach the power transmitter 43. When the capacity of the secondary battery 51 of the hand switch 16 decreases, the hand switch 16 is moved to a predetermined charging position in the explosion-proof area A, and the power receiver 52 of the hand switch 16 is transferred to the power transmitter 53 of the charging device 50. Move closer. Further, when the capacity of the secondary battery 61 of the flow meter 17 decreases, the power transmitter 63 of the charging device 60 is moved in the explosion-proof area A and is brought closer to the power receiver 62 of the flow meter 17. When the power transmitters 43, 53, 63 and the power receivers 42, 52, 62 are brought close to each other as described above, the power supplied from the commercial AC power source 77 is received from the power transmitters 43, 53, 63, the power receivers 42, 52, The non-contact (non-contact) data is transmitted to 62, and the secondary batteries 41, 51, 61 are charged.

<Effect of Example>
The electrostatic coating apparatus according to the present embodiment includes a coating device (an electrostatic coating gun 10, a hand switch 16, a flow meter 17) that functions when supplied with electric power, and a rechargeable device provided in the coating device. Secondary batteries 41, 51, 61 and charging devices 40, 50, 60 for charging secondary batteries 41, 51, 61 provided in the painting equipment are provided. The charging devices 40, 50, 60 include power receivers 42, 52, 62 provided in the painting device in a state connected to the secondary batteries 41, 51, 61, and a power receiver 42 disposed in the explosion-proof area A. , 52, 62. The power receivers 42, 52, 62 are connected to a commercial AC power supply 77 disposed in the non-explosion-proof area A, and the power supplied from the commercial AC power supply 77 is transmitted to the power receivers 42, 52, 62 without contact. It has become. The rechargeable batteries 41, 51, 61 are charged by the charging devices 40, 50, 60.

  When charging the secondary batteries 41, 51, 61 of the painting equipment (electrostatic coating gun 10, hand switch 16, flow meter 17), the power transmitters 43, 53, 63 to the power receivers 42, 52, 62. Power transmission without contact. Therefore, when the secondary batteries 41, 51, 61 are consumed, the secondary batteries 41, 51, 61 can be charged in the explosion-proof area A while being attached to the painting equipment. Thus, according to the electrostatic coating device and the charging devices 40, 50, 60 of the present embodiment, it is possible to take measures against the consumption (charging) of the secondary batteries 41, 51, 61 in the explosion-proof area A. In addition, a commercial AC power supply 77 that is a power source for charging the power storage member is disposed in the non-explosion-proof area B.

  The electrostatic coating gun 10 includes a barrel portion 21 in which a nozzle 23 is provided at a front end portion and a high voltage generator 35 is accommodated therein, and extends downward from a rear end portion of the barrel portion 21 so as to be lowered by an operator. A grip 22 is provided, and an accommodation space 71 is formed in the grip 22. According to this configuration, since the relatively heavy secondary battery 41 (battery pack 70) is disposed in the grip 22 held by the operator, the position of the center of gravity of the electrostatic coating gun 10 is close to the grip 22. Become. This means that the weight balance of the electrostatic coating gun 10 is good for the worker holding the grip 22, so the burden on the worker is reduced.

  Moreover, the electrostatic coating gun 10 has an air flow path 27 for supplying air to the nozzle 23, and the main flow path 75 and the circulation flow path 76 constituting the air flow path 27 are formed by the secondary battery 41 ( It is formed so as to face the outer surface of the battery pack 70). According to this configuration, the secondary battery 41 that rises in temperature during power feeding to the high voltage generator 35 can be cooled by the air flowing through the air flow path 27.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the electricity storage member of the electrostatic coating gun (secondary battery) is cooled by air, but the air flow path may be formed by a path that passes through a position away from the electricity storage member. .
(2) In the above embodiment, the power storage member (secondary battery) is housed inside the gun body (grip), but a part of the power storage member may be exposed outside the gun body.
(3) In the above embodiment, the electricity storage member (secondary battery) of the electrostatic coating gun is arranged on the grip, but the electricity storage member may be arranged on the barrel portion.
(4) In the above embodiment, a secondary battery that stores electric energy by a chemical reaction at an electrode is used as the power storage member. However, the power storage member may be an electric double layer capacitor that stores charges by ionic molecules.
(5) In the above embodiment, the commercial AC power supply is used as the charging power supply. However, the charging power supply is not limited to the commercial AC power supply, and may be a generator or the like.
(6) In the above embodiment, the case where the electrostatic coating gun is a hand gun operated by an operator has been described. However, the present invention is an automatic gun in which the electrostatic coating gun is driven by a robot, a reciprocator, or the like. It can also be applied to cases.
(7) In the above embodiment, the power transmitter is installed in the explosion-proof area, but the power transmitter may be installed in the non-explosion-proof area, and power transmission may be performed through the wall that partitions the explosion-proof area and the non-explosion-proof area.

10 ... Electrostatic painting gun (coating equipment)
16 ... Hand switch (painting equipment)
17 ... Flow meter (coating equipment)
DESCRIPTION OF SYMBOLS 21 ... Gun barrel part 22 ... Grip 23 ... Nozzle 27 ... Air flow path 35 ... High voltage generator 40, 50, 60 ... Charging device 41, 51, 61 ... Secondary battery (electric storage member)
42, 52, 62 ... power receiver 43, 53, 63 ... power transmitter 77 ... commercial AC power supply (charging power supply)
B ... Non-explosion-proof area

Claims (5)

A nozzle for discharging paint,
A high-voltage generator that applies static electricity to the paint,
A power storage member that is rechargeable and supplies power to the high voltage generator;
A power receiver connected to the power storage member,
The electrostatic coating gun, wherein the power storage member is charged by a power transmitter that transmits electric power from a charging power source provided in a non-explosion-proof region to the power receiver without contact. A barrel part in which the nozzle is provided at the front end and the high voltage generator is accommodated therein,
A grip that extends downward from the rear end of the barrel portion and is gripped by an operator,
The electrostatic coating gun according to claim 1, wherein the power storage member is formed inside the grip. An air flow path for supplying air to the nozzle;
The electrostatic coating gun according to claim 1, wherein the air flow path is formed so as to face an outer surface of the power storage member. A charging device for charging a power storage member provided in an electrostatic coating gun and supplying power to a high voltage generator ,
A power receiver provided on the electrostatic coating gun and connected to the power storage member;
A charging device for an electrostatic coating gun, comprising: a power transmitter connected to a charging power source provided in a non-explosion-proof region and capable of transmitting power to the power receiver in a contactless manner. Painting equipment that works when powered,
A chargeable power storage member provided in the painting device;
A power receiver provided in the coating device and connected to the power storage member;
An electrostatic coating apparatus comprising: a power transmitter connected to a charging power source provided in a non-explosion-proof region and capable of transmitting power to the power receiver in a contactless manner.

Images